Here's the full extract:
"Very likely, in that case," said a fourth, "we shall wait here till Christmas. Shouldn't wonder, did we not see that kind gentleman again. After seeking awhile in vain, he will conclude he has been made a fool of, and so not return to us for pure shame. Fact is, I begin to feel a little qualmish about the darkie myself. Something queer about this darkie, depend upon it."
Depend on what? On the fact the gentleman won't return?